Shapeshifters

I'm looking for series about shapeshifters. I looked in the Shapeshifter and Transformation categories and some of them sound like they might be what I'm looking for, but I'd definitely appreciate suggestions. Anyway, I'd most want to read one with a voluntary shapeshifter protagonist, like Divine Melody. Series with involuntary shapeshifting protagonists/antagonists and voluntary shapeshifting secondary characters/antagonists, like in Ranma 1/2, Fruits Basket, Princess Tutu, or Blaster Knuckle, would be fine too. I don't want to read about permanent transformations or body horror shapeshifting.

The only one that comes now to mind is Yami no Purple Eye.If i remember another one i will return and post it.

________________Deep into that darkness peering, long I stood there wondering, fearing,Doubting, dreaming dreams no mortal ever dared to dream before;But the silence was unbroken, and the darkness gave no token,And the only word there spoken was the whispered word, `Lenore!'This I whispered, and an echo murmured back the word, `Lenore!'Merely this and nothing more.

A Thousand Years NinetailsMaybe Kubera. The main character isn't a shapeshifter, but all the Sura are shapeshifters, and 3 of them are listed as main characters a well. I'm not sure if it's the type you're looking for, though.